Installation of the Blue Electric-Pump Current Transformer

TASK 29-12-15-400-001-A
Installation of the Blue Electric-Pump Current Transformer

WARNING: ISOLATE ALL THE AIRCRAFT ELECTRICAL CIRCUITS.

CAUTION: MAKE MATCH MARKS ON ALL THE ELECTRICAL WIRES BEFORE YOU DISCONNECT THEM. INCORRECT CONNECTION OF WIRES WILL CAUSE DAMAGE TO EQUIPMENT.

FIN: 2706GJ

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.28 and 0.22 m.daN (24.78 and 19.47 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121AL, 822

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-12-00-710-002-A	Operational Test of the Phase Unbalance Detector and the Current Transformer of the Blue Hydraulic System
Blue Electric-Pump Current Transformer

3. Job Set-up
Subtask 29-12-15-860-051-A

A. Aircraft Maintenance Configuration
(1) Make sure that the external power connector is not connected to the aircraft receptacle (20XG) (receptacle behind the access door 121AL).
(2) Make sure that the WARNING NOTICE(S) is (are) in position on the access door 121AL to tell persons not to connect the external power connector.
(3) In the cockpit, on the overhead panel 35VU, make sure that these pushbutton switches are released:

APU GEN,
1 BAT 2,
GEN1, GEN2,
EXT PWR.

(4) In the cockpit, make sure that the WARNING NOTICE(S) to tell persons not to operate the pushbutton switches is (are) in position on these overhead panels:

21VU (EMER ELEC PWR),
25VU (APU),
35VU (ELEC).

(5) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the access door 822.
(6) Make sure that the access door 822 is open.

4. Procedure
Subtask 29-12-15-420-050-A

A. Installation of the Current Transformer
(1) Engage the electrical wires (4) in their passages in the transformer (8).
(2) Install the transformer (8) on its mount.
(3) Install the washers (3) and the screws (2).
(4) TORQUE the screws (2) to between 0.28 and 0.22 m.daN (24.78 and 19.47 lbf.in )

.
(5) Connect the electrical wires (4) to the contactor (10).
(6) Install the washers (12) and the nuts (11).
(7) Install the clamp (5) on its mount with the washer (6) and the screw (7).
(8) Remove the blanking cap from the electrical connector (9).
(9) Connect the electrical connector (9) to the transformer (8).

Subtask 29-12-15-860-052-A

B. Preparation for the Test
(1) Remove the WARNING NOTICE(S).
(2) On the overhead panel 35VU, push these pushbutton switches:

APU GEN,
GEN 1, GEN 2.

(3) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 29-12-15-865-053-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
123VU	B HYD/ELEC PUMP	2701GJ	AB09

Subtask 29-12-15-710-050-A

D. Test
(1) Do the operational test of the transformer (Ref. AMM TASK 29-12-00-710-002).

5. Close-up
Subtask 29-12-15-860-053-A

A. Put the aircraft back to its initial configuration
(1) Make sure that the work area is clean and clear of tools and other items.
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 29-12-15-410-050-A

B. Close Access
(1) Install the access cover (1) on the panel 107VU.
(2) Close the access door 822.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 00:18:54 UTC